Azure load balancing Round Robin and VM Instance IDs

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Hi I am working with a single http endpoint that i can send requests to. I am working with Azure load balancer which should balance requests between 4 VMs. According to what i have read so far. The load balancer should use a round robin method to do the routing.

How do I make http requests in such a way that I am sure I have hit all the VMs and not just the first VM. I suppose I must do a concurrent request of some sort. Maybe an asynchrounous parallel request? The VMs have identical data so its pertinent that I hit all 4 VMs with 4 requests. I hope my question is clear enough

Also I have the VM server instance Id's. How do i use the id's to specify the server i want to hit in the request.

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c#azurehttprequestload-balancingazure-virtual-machine
Azure Load balancer is not RR (see docs.microsoft.com/en-us/azure/load-balancer/…). Other services could be (see docs.microsoft.com/en-us/azure/traffic-manager/…). Can you clarify ""its pertinent that I hit all 4 VMs with 4 requests". – JohnMark13
Yes i need to somehow tell the server which vm i want to hit in my request. I am new to this so i dont know if there are default headers forexample that allow specifying the server instance – flexxxit
I think that you are looking at the wrong infrastructure pattern as you should probably be trying not to direct your traffic to a specific server (unless you are after "sticky sessions" which can sort of be achieved using "Source IP affinity mode" again see docs.microsoft.com/en-us/azure/load-balancer/…. Can you update your question to reflect what you are trying to achieve and maybe why? – JohnMark13

1 Answers

1
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The load balancer should use a round robin method to do the routing.

As JohnMark13 said, Azure load balancer have two modes: Hash-based distribution mode and Source IP affinity mode.

For now, Azure Load balancer does not support specify VM id to access it, just support IP address + port.

As a workaround, I think we can set NAT rules, set different ports to different VMs, so we can access different VMs with IP address and different ports.

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More information about Azure load balancer and NAT rules, please refer to this link.